My plant has just recoverd from Servo valve failures caused by fine particulate (<3 micron) wear or electo-kinetic wear. To protect against this from happening again one thing we are considering is a change in fluid. We currently use Azko Noble Fyrquel EHC. I need info on other reliable products to research. I have heard of a Bio-Synthetic that is fireproof, made of Corn oil and has a resistivity value of 150. Does anyone have any info on BIO-Syn or EcoSafe EHC?

Thanks,

You need a way to remove submicron particles. That technology is available from my company, Isopur. We can also supply an ion exchange medium to control acid in your EHC fluid. Call me and I will explain the process for submicron control.

Might also be worth looking at Spinner II centrifuges which will remove particles continuously down to less than a micron and do not have costly filter elements. You can google them.

Dear PhilsTJ,

If the Issue is Sub-micron Particles, then Ray's suggestion is appropriate. However; I would ask for the complete root cause analysis which lead to the dual diagnosis of sub-micron Particles or electrokenetic wear. If you would like an in-depth dialog, I would suggest you send me and Ray an email and then compare the answers to make an informed decision. Please propvide with your email a 2-year history of oil analysis.

gmunson@fluid-assets.com

We're not quite done with the write-up yet. We have lots of facts to compile.

A brief history is all that is needed. In November 2007 installed new EHC pumping filetering skid with all new fluid, new Hoses and new Moog Servos. Used old piping but flushed prior to connecting up to Servos.

We did find out that the CPE (chlorinated poly - ethylene) rubber based hose does react to Phosephate-esters in that the Chlorides leach out into the fluid to 60-70ppm.

Yes, finding the root cause of the <3 micron particles is important to prevent the reoccurrence of the problem. Once you do, you may want to look at electrostaic oil conditioning systems from Kleentek for the control of varnish and sub micronic particulate. Please contact me for more information.

If you still want some information on Ecosafe EHC i can provide you all the information you want and need. let me know if you are still interested.

We build systems specifically for fire proof hydraulic fluid.

Give me a call or check us out on the web at www.como.biz

Best regards,

Kevin M. Mikulaj
Sales Manager
COMO Filtration Systems
(800) 451-0028